MICROSCOPIC FORMS IN FRESH WATER. 



19 



Pseudoeunotia . 



Stauroneus. 



Svnedra. 



purva. 



liobilis. 



tabellaria. 



tuniidula. 



flexuosa. 



acuta. 



I 111 gens. 



pnlchella. 



ulna. 



ROTIFER. 



Scaridiiun. 

 Triartlira. 



RIZOPODS. 



Actinophys. sol. 



Cyi)hoderia. ampulla. 



VARIOUS FORMS. 



Stylonehia, Paramecia. Macrobiotus anierieanus, Chaetonotus 

 acanthopherus, Daphnia i)ulex. Euglinse ej^liais 



These are about all the forms observed in addition to those 

 mentioned in Bulletin No. 3. 



In reading over notes taken at the time I find that the process 

 of parturition >vas watched in a canthocamptus during half an 

 hour, and twelve ycnmg escaped during that time; but, being cal- 

 led awiiv, I did not see the whole process. There are other forms 

 mentioned above that caused the writer a good deal of trouble — 

 for instance, micrasterias denticulata. There is no autlior, to 

 which 1 have access, that has a correct plate of this form . After 

 sending it round to various experts I was directed to the late Dr. 

 Bailey's work, and, applving to his son. Dr. Bailey of N. B. 

 University, he kindly took the troul>le to make me a very nioe 

 sketch of micrasterias denticulata from his father's work, that 

 filled the bill and settled the point. I do not know whether this 

 form is very generally dispersed or not, hut I have found it in 

 three or four places here. Dr. Bailey speaks of his father's having 

 found it in the Southern States. 



There is another form that I Avish to call attention to, viz., the 

 diatom Pseudoeunotia flex. Not being able to place it, a speci- 

 men was sent to Philadelphia and the following answer received: 



